text: Oops! Wrong answer.\n\nWhat I should have done first is check the density of both liquids before answering.\n\nWhole milk has a density of 1030 km/m3,\nwhile water at 20 degrees C is 998.21 km/m3.\n\nIf they have the same volume, than whole milk is a little heavier than water. Which isn't surprising, since milk is about 87% water.